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Envisat ("Environmental Satellite") is an inoperative Earth-observing satellite still in orbit. It was launched on 1 March 2002 aboard an Ariane 5 from the Guyana Space Centre in Kourou, French Guiana, into a Sun synchronous polar orbit at an altitude of (± ). It orbits the Earth in about 101 minutes with a repeat cycle of 35 days. After losing contact with the satellite on 8 April 2012, ESA formally announced the end of Envisat's mission on 9 May 2012.〔(【引用サイトリンク】 title=ESA declares end of mission for Envisat )〕 Envisat is the European Space Agency's (ESA) largest civilian Earth observation satellite put into space.〔(EarthNet Online )〕 == Mission == Envisat was an Earth observation satellite. Its objective was to service the continuity of European Remote-Sensing Satellite missions, providing additional observational parameters to improve environmental studies. In working towards the global and regional objectives of the mission, numerous scientific disciplines currently use the data acquired from the different sensors on the satellite, to study such things as atmospheric chemistry, ozone depletion, biological oceanography, ocean temperature and colour, wind waves, hydrology (humidity, floods), agriculture and arboriculture, natural hazards, digital elevation modelling (using interferometry), monitoring of maritime traffic, atmospheric dispersion modelling (pollution), cartography and study of snow and ice. Envisat cost €2.3 billion (including €300 million for 5 years of operations) to develop and launch.〔(European Space Agency web-site )〕 The mission is due to be replaced by the Sentinel series of satellites. The first of these, Sentinel 1, has taken over the radar duties of Envisat since its launch in 2014. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Envisat」の詳細全文を読む スポンサード リンク
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